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Student practical training / Bachelor theses / Master theses / Diploma theses

dynamics of antibubbles (Id 307)

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Foto: Antibubble ©Copyright: Dr. Martin RudolphAntibubbles are liquid droplets that are surrounded by a gas film, again suspended in liquid. This makes them virtually the opposite of soap bubbles (liquid film, gas outside and inside). They occur frequently in everyday life, but are very short-lived. In surfactant solutions, for example when doing the dishes, their lifetime can be much longer. This depends on the properties of the gas-liquid interface. The interactions between several antibubbles have not yet been investigated.
In collaboration with the Helmholtz Institute Freiberg for Resource Technology (Dr. Martin Rudolph), the dynamics of several antibubbles will be investigated via different optical measurement methods. First, defined conditions for the production of the antibubbles are to be found: Testing of different surfactants, variation of density ratio/density gradients, viscosity and composition of the inner and outer aqueous phase.
Subsequently, the interaction of several antibubbles during approach and collision will be recorded. The following spectrum of measurement methods is available and can be used for different aspects of this topic: Microscopy with high-speed camera, schlieren and shadowgraph methods, particle image velocimetry, tensiometry, pycnometry and viscosity measurement.

Institute: Institute of Fluid Dynamics

Contact: Dr. Schwarzenberger, Karin, Dr. Rudolph, Martin

Requirements

  • Field of study: process engineering, chemical engineering, fluid mechanics, or similar orientation in physics/chemistry
  • Laboratory experience
  • Experience with optical measurement techniques/image analysis is advantageous
  • High motivation and interest in the subject
  • Good oral and written communication, independent working style

Conditions

  • Duration min. 4 months, payment corr. HZDR regulations, workplace: TU Dresden